Furnace-protector



(No Model.)

D. R. FRASER.

FURNACE PROTECTOR. v v No. 284,880. Patented Sept. 11, 1888.

Inventor Witnesses N. PETERS. Plluio-Lllhagnplmr. Wnhinglon, D. C.

UNITED STATES PATENT Gimme.

DAVID R. FRASER, or CHICAGO, ILLINOIS.

FURNACE-PROTECTO R.

SPECIFICATION forming part of Letters Patent No. 284,830, dated September-11, 1883.

Application filed June 9, 1883. (NomodclJ lowing is an accurate description of the same.

The solid matters held in suspension in running water are deposited as sediment when the motion of the Water is retarded, and this deposition is facilitated by the heat, which converts a portion of the water into vapor; hence the deposit of sediment which takes place in the water-jackets of such furnaces as are provided with them. This sediment, in addition to its obstruction of the water-space, prevents the abstraction of heat from the lining of the furnace-,which is the function of the water within the jacket, and hence the furnace ceases to be protected by the water.

The object of my invention is to produce a rapid flow of the water along the bottom of the water-space, and to facilitate the removal of such sediment as accumulates in the water within the jacket by blowing the same out.

That others may understand my improve ment, I will particularly describe the same, having reference to the accompanying drawings, wherein- Figure 1 is a central sectional elevation of my furnace. Fig. 2 is a horizontal section of the same; Fig. 3, a section and plan of the discharging-nozzle. Fig. 4 is a sectional elevation, showing a modified structure.

A is the inner shell of the water-jacket, of which B indicates the water-space. WVater is introduced by a pipe, D, communicatingwith a pipe, F, which passes within the water-space and around the furnace. A number of pipes, G, descend from the pipe F to points near to the bottom of the water-space, where they terminate in horizontal nozzles g, which I prefer to flatten, as shown in Fig. 3, so as to deliver the water at the bottom of the water-space in expanding horizontal jets. These nozzles are all turned in the same direction, and therefore the water has imparted to it a circulating v flow along the bottom of the water-space, said flow being naturally more rapid at the bottom than at higher levels, andtherefore it is unable to deposit its sediment. By making the caliber of the nozzle-outlet {1 less than the caliber of the pipe G, the water will issue with velocity greater than its velocity within the pipe G, and this also will diminish its power to deposit sediment.

The inlet-pipe enters the water-jacket near its top,and then discharges through the downpipes G at the bottom of the jacket, for the purpose of warming the feed water before discharging it against the furnace lining. Were it not undesirable to discharge cold water against the furnace-lining at'its hottest part, the feed-water might be entered at the bottom of the jacket more easily than by the way shown.

H is the overflow-pipe, and K is a supplemental feed-pipe, to be used if for any reason the outlet from the nozzle 9 is not sufficient. 7o WVhen it is desired to blow out the water and its accumulated sedimentary matter held in suspension, steam is injected at G from the steam-pipe E, and the mud may thus be forced up and through the overflow H. A blow-off cock may also be placed at the bottom of the water-space, if dGSIIQCL' In Fig. 4 the pipe F is placed at the bottom of the waterspace, and, instead of the depending pipes G and nozzles g, the water is 80 discharged through holes 71, drilled at an angle to the axis, as shown in Fig. 4, so that it has imparted to it a circulating movement,

and deposit of sediment is prevented.

Having described my invention, what I claim as new is 1. A cylindrical water-jacket, A, with the inclosed water-space B, combined with an in-' let-pipe, F,which is provided with dischargeopenings adapted to discharge the feed-water in one horizontal direction, and an overflow or outlet pipe at the top of said j acket,whereby the water within the jacket has imparted to it a flow in an upward spiral direction.

2. In combination, the water-jacket spaceB within the jacket A, the circulating inlet-pipe F, and a series of pipes, G, communicating with and depending from the pipe F, each of said pipes G being provided with a flattened horizontal jet, for the purpose of giving the 100 dischargewater a uniform direction and increased velocity.

3. The method herein described of securing 4. The Water-jacket A and inclo'sed Watera positive circulation of the water and disspace B, and the inlet circulating-pipe F, com- 10 charge of accumulated sediment, which conbined with the supplemental steam-pipeE and sists in introducing the feed-water in one or injector O, substantially as set forth.

5 more horizontal jets'and the introduction of a 7 DAVID R. FRASER.

supplemental jet of Water or steam, orboth, un- XVitness'es: der pressure higher than the normal pressure I ALEXANDER F. VVHITEHEAD,

of the feed. NORMAN D. FRASER. 

